User's Guide

N - Mode: Select this mode to test passive/non-standard PoE.
If you are not sure if the PSE you are testing is standard or non-standard PoE, select the T-Mode first and
then connect the PSE to the tester’s PSE port. If the tester’s display does not show any reading, it is most
likely a passive PoE PSE. Disconnect the PSE from the tester, select N-Mode and reconnect the PSE to
the tester.
During the testing, if you see “HI” on the tester’s display, this means the tester detects voltage of over
60V. When this happens, disconnect all the cables from the tester to avoid damaging the tester.
For inline testing, after connecting the PSE to the tester, you should see a voltage reading, then you can
connect a compatible PD to the tester.
Testing PSE (in N-Mode and T-Mode)
Note:
- During the testing, if you see “HI” on the tester’s display, this means the tester detects voltage of over
60 volts. When this happens, disconnect all the cables from the tester to avoid damaging the tester.
- When performing testing in “T-Mode”, limit the testing time to less than 20 minutes to avoid
overheating the tester.
Most of the PoE injectors on the market are passive PoE injectors and the power is always available at
the PoE port. If the injector provides higher voltage then the PD needs, it can damage the PD. This is why
it is very important to check and make sure your injector and PD are compatible before connecting them
together.
When testing injector/PSE, if you are not sure if it is standard PoE or not, set the tester to T-Mode and
then connect the PSE to the tester’s PSE port. If there is no reading on the display, then the PSE is
probably Passive PoE. Disconnect the PSE, set the tester to N-Mode and then reconnect the PSE. If there
is no reading again in N-Mode, then the PSE is not a PoE device or it is not working correctly.
In N-Mode, if the voltage reading is on the tester’s upper display, the PSE is Mode A (Endspan). If the
reading is on the lower display, the PSE is Mode B (Midspan).
In T-Mode, in addition to displaying the PSE’s voltage, the tester also detects PSE’s PoE standard (IEEE
802.3af, at, or bt), Mode A or B, and if it is reversed polarity. Please reference the LED indicator section
above for more information.